CVE-2024-12378CWE-319

On affected platforms running Arista EOS with secure Vxlan configured, restarting the Tunnelsec agent will result in packets being sent over the secure Vxlan tunnels in the clear.

Critical · published May 8, 2025

CVSS v3.1
9.1
EPSS
1%
Percentile
42.0
In the wild
Unconfirmed
What it is

🚨 Restarting the Tunnelsec agent on Arista EOS can expose your secure Vxlan packets in the clear! What a shocker! 🔥 Think of your secure Vxlan as a pristine, sealed envelope containing your confidential documents. But when the Tunnelsec agent restarts, it’s like accidentally opening that envelope so anyone can see what’s inside — yikes! An attacker could intercept sensitive data flowing through your Vxlan tunnels, compromising the confidentiality of your network communications. This oversight could lead to disastrous security breaches, exposing critical information to prying eyes!

Put simply

Think of your secure Vxlan as a pristine, sealed envelope containing your confidential documents. But when the Tunnelsec agent restarts, it’s like accidentally opening that envelope so anyone can see what’s inside — yikes! This vulnerability arises when the Tunnelsec agent is restarted on Arista EOS systems with secure Vxlan configured, resulting in packets being transmitted without encryption, effectively turning secure channels into open ones.

What to do

An attacker could intercept sensitive data flowing through your Vxlan tunnels, compromising the confidentiality of your network communications. This oversight could lead to disastrous security breaches, exposing critical information to prying eyes! Immediately apply the patch provided by Arista to mitigate this vulnerability. Regularly audit your network configuration and monitor for unusual traffic that could indicate interception attempts. Stay vigilant and ensure that proper procedures are in place for restarting critical services! You've got this! By following these steps, you're on your way to keeping your network secure and your data safe! 🛡️

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00501 · 42.0th percentile
Weakness
CWE-319 · Cleartext Transmission of Sensitive Information
Published
2025-05-08T19:05Z
EPSS history
Timeline
  • 08 MAY 19:05Z
    On affected platforms running Arista EOS with secure Vxlan configured, restarting the Tunnelsec agent will result in packets being sent over the secure Vxlan tunnels in the clear.
    cvelistv5